Ford's all-conquering Mustang race car has been ordered to undergo aerodynamic changes by Supercars officials.
Ongoing analysis by Supercars, including track data from the recent championship event at Phillip Island, has determined the Mustang holds an aerodynamic edge over it's Holden and Nissan rivals.
Led by DJR Team Penske's Scott McLaughlin, the Mustang has won nine out of 10 races in 2019 and eight pole positions.
Its dominance has led to rival teams claiming the new vehicle has an unfair advantage.
Supercars has ordered the Mustangs to undergo alterations to its aero package, mainly its rear wing, ahead of the night races in Perth on May 3 and 4.